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Message-ID: <163456920740.2614702.10833323576114946075.stgit@warthog.procyon.org.uk>
Date: Mon, 18 Oct 2021 16:00:07 +0100
From: David Howells <dhowells@...hat.com>
To: linux-cachefs@...hat.com
Cc: dhowells@...hat.com, Trond Myklebust <trondmy@...merspace.com>,
Anna Schumaker <anna.schumaker@...app.com>,
Steve French <sfrench@...ba.org>,
Dominique Martinet <asmadeus@...ewreck.org>,
Jeff Layton <jlayton@...hat.com>,
Matthew Wilcox <willy@...radead.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Omar Sandoval <osandov@...ndov.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-afs@...ts.infradead.org, linux-nfs@...r.kernel.org,
linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
v9fs-developer@...ts.sourceforge.net,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 36/67] fscache: Add stats for the cookie commit LRU
Add some stats to indicate the state of the cookie commit LRU, including an
indication of how many are currently on it, how many have been expired,
removed (withdrawn/reused) or dropped (relinquished) from it and how long
till the next reap happens.
Signed-off-by: David Howells <dhowells@...hat.com>
---
fs/fscache/cookie.c | 10 +++++++++-
fs/fscache/internal.h | 5 +++++
fs/fscache/stats.c | 12 ++++++++++++
3 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index dfc61b2e105d..c6b553609f33 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -28,7 +28,7 @@ static LIST_HEAD(fscache_cookies);
static DEFINE_RWLOCK(fscache_cookies_lock);
static LIST_HEAD(fscache_cookie_lru);
static DEFINE_SPINLOCK(fscache_cookie_lru_lock);
-static DEFINE_TIMER(fscache_cookie_lru_timer, fscache_cookie_lru_timed_out);
+DEFINE_TIMER(fscache_cookie_lru_timer, fscache_cookie_lru_timed_out);
static DECLARE_WORK(fscache_cookie_lru_work, fscache_cookie_lru_worker);
static const char fscache_cookie_stages[FSCACHE_COOKIE_STAGE__NR] = "-LCAIFMWRD";
unsigned int fscache_lru_cookie_timeout = 10 * HZ;
@@ -60,6 +60,8 @@ static void fscache_free_cookie(struct fscache_cookie *cookie)
spin_lock(&fscache_cookie_lru_lock);
list_del_init(&cookie->commit_link);
spin_unlock(&fscache_cookie_lru_lock);
+ fscache_stat_d(&fscache_n_cookies_lru);
+ fscache_stat(&fscache_n_cookies_lru_removed);
}
write_lock(&fscache_cookies_lock);
list_del(&cookie->proc_link);
@@ -525,6 +527,7 @@ void __fscache_unuse_cookie(struct fscache_cookie *cookie,
if (list_empty(&cookie->commit_link)) {
fscache_get_cookie(cookie, fscache_cookie_get_lru);
list_move_tail(&cookie->commit_link, &fscache_cookie_lru);
+ fscache_stat(&fscache_n_cookies_lru);
}
spin_unlock(&fscache_cookie_lru_lock);
timer_reduce(&fscache_cookie_lru_timer,
@@ -624,10 +627,12 @@ static void fscache_cookie_lru_do_one(struct fscache_cookie *cookie)
time_before(jiffies, cookie->unused_at + fscache_lru_cookie_timeout) ||
atomic_read(&cookie->n_active) > 0) {
spin_unlock(&cookie->lock);
+ fscache_stat(&fscache_n_cookies_lru_removed);
} else {
__fscache_set_cookie_stage(cookie, FSCACHE_COOKIE_STAGE_COMMITTING);
set_bit(FSCACHE_COOKIE_DO_COMMIT, &cookie->flags);
spin_unlock(&cookie->lock);
+ fscache_stat(&fscache_n_cookies_lru_expired);
_debug("lru c=%x", cookie->debug_id);
__fscache_withdraw_cookie(cookie);
}
@@ -652,6 +657,7 @@ static void fscache_cookie_lru_worker(struct work_struct *work)
}
list_del_init(&cookie->commit_link);
+ fscache_stat_d(&fscache_n_cookies_lru);
spin_unlock(&fscache_cookie_lru_lock);
fscache_cookie_lru_do_one(cookie);
spin_lock(&fscache_cookie_lru_lock);
@@ -673,6 +679,8 @@ static void fscache_cookie_drop_from_lru(struct fscache_cookie *cookie)
spin_lock(&fscache_cookie_lru_lock);
if (!list_empty(&cookie->commit_link)) {
list_del_init(&cookie->commit_link);
+ fscache_stat_d(&fscache_n_cookies_lru);
+ fscache_stat(&fscache_n_cookies_lru_dropped);
need_put = true;
}
spin_unlock(&fscache_cookie_lru_lock);
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index f74f7bdea633..62e6a5bbef8e 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -32,6 +32,7 @@ struct fscache_cache *fscache_lookup_cache(const char *name, bool is_cache);
*/
extern struct kmem_cache *fscache_cookie_jar;
extern const struct seq_operations fscache_cookies_seq_ops;
+extern struct timer_list fscache_cookie_lru_timer;
extern void fscache_print_cookie(struct fscache_cookie *cookie, char prefix);
extern bool fscache_begin_cookie_access(struct fscache_cookie *cookie,
@@ -70,6 +71,10 @@ extern atomic_t fscache_n_volumes;
extern atomic_t fscache_n_volumes_collision;
extern atomic_t fscache_n_volumes_nomem;
extern atomic_t fscache_n_cookies;
+extern atomic_t fscache_n_cookies_lru;
+extern atomic_t fscache_n_cookies_lru_expired;
+extern atomic_t fscache_n_cookies_lru_removed;
+extern atomic_t fscache_n_cookies_lru_dropped;
extern atomic_t fscache_n_retrievals;
extern atomic_t fscache_n_retrievals_ok;
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index 13e90b940bd2..5700e5712018 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -18,6 +18,10 @@ atomic_t fscache_n_volumes;
atomic_t fscache_n_volumes_collision;
atomic_t fscache_n_volumes_nomem;
atomic_t fscache_n_cookies;
+atomic_t fscache_n_cookies_lru;
+atomic_t fscache_n_cookies_lru_expired;
+atomic_t fscache_n_cookies_lru_removed;
+atomic_t fscache_n_cookies_lru_dropped;
atomic_t fscache_n_retrievals;
atomic_t fscache_n_retrievals_ok;
@@ -89,6 +93,14 @@ int fscache_stats_show(struct seq_file *m, void *v)
atomic_read(&fscache_n_acquires_nobufs),
atomic_read(&fscache_n_acquires_oom));
+ seq_printf(m, "LRU : n=%u exp=%u rmv=%u drp=%u at=%ld\n",
+ atomic_read(&fscache_n_cookies_lru),
+ atomic_read(&fscache_n_cookies_lru_expired),
+ atomic_read(&fscache_n_cookies_lru_removed),
+ atomic_read(&fscache_n_cookies_lru_dropped),
+ timer_pending(&fscache_cookie_lru_timer) ?
+ fscache_cookie_lru_timer.expires - jiffies : 0);
+
seq_printf(m, "Invals : n=%u run=%u\n",
atomic_read(&fscache_n_invalidates),
atomic_read(&fscache_n_invalidates_run));
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